The BMW M10/M12 was an I4 piston engine produced from 1961 to 1983. Displacement ranged from 1499cc to 1990cc.
The engine was designed by Baron Alex von Falkenhausen , noted engineer and race driver. von Falkenhausen was asked to design a small-displacement (1.3 L) engine, but he felt that this would be insufficient for the company's future needs. Therefore, he designed a block that could be expanded to 2.0 L and delivered it at 1.5 L. The design was very successful, with over 3.5 million produced, and it served the company for over 20 years.
M115
The 1.5 L (1499 cc) M115 produced 75 or 80 hp (56 or 60 kW) (depending on carburetor) and 118 ft.lbf (160 Nm).
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M118
The 1.8 L (1773 cc) M118 produced 90 to 130 hp (67 to 97 kW) and 143 to 150 ft.lbf (194 to 203 Nm).
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M116
The 1.6 L (1573 cc) M116 produced 75 to 105 hp (56 to 78 kW). Bore was 84 mm and stroke was 71 mm.
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M05
The 2.0 L (1990 cc) M05 produced 100 to 120 hp (75 to 90 kW) and 157 to 167 ft.lbf (213 to 226 Nm). Bore was 89 mm and stroke was 80 mm.
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M15
The 2.0 L (1990 cc) M15 produced 130 hp (97 kW) and 177 ft.lbf (240 Nm). It was the famed tii engine.
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M17
The 2.0 L (1990 cc) M17 produced 115 hp (86 kW) and 162 ft.lbf (220 Nm).
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M31
The 2.0 L (1990 cc) M31 was turbocharged and produced 170 hp (127 kW) and 240 ft.lbf (325 Nm).
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M41
The 1.6 L (1573 cc) M41 produced 90 hp (67 kW) and 123 ft.lbf (167 Nm).
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M64
The 2.0 L (1990 cc) M41 produced 125 hp (93 kW) and 172 ft.lbf (233 Nm).
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M43/1
The 2.0 L (1990 cc) M43/1 produced 109 hp (81 kW) and 157 ft.lbf (213 Nm).
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M42
The 1.8 L (1766 cc) M41 produced 98 hp (73 kW) and 142 ft.lbf (193 Nm).
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M98
The 1.6 L (1573 cc) M41 produced 75 hp (56 kW) and 110 ft.lbf (149 Nm).
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M10B18
The 1.8 L (1766 cc) M41 (also known as the M98) produced 90 hp (67 kW) and 137 ft.lbf (186 Nm).
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See also
